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a letter.
* Individual flags have specific and standard meanings; for example, diving support vessels raise the "A" (Alfa) flag indicating their inability to move from their current location because they have a diver underwater and to warn other vessels to keep clear to avoid endangering the diver(s) with their propellers.
* One or more flags can form a code word whose meaning differs from the standard code, such as when used by various navies or private organizations. An example

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